Exlar Electric Test and Simulation Actuator Systems

Delivering more accurate and trouble-free test actuators. Exlar Electric Test and Simulation Actuator Systems Courtesy of Steven Engineering, Inc. - 230 Ryan Way, South San Francisco, CA 94080-5370 - Main Office: (650) 588-9200 - Outside Local Area: (800) 258-9200 - www.stevenengineering.com entertainment simulators, Exlar actutors are Paradigm Shift ergonomic endurance directly controlled in Mechanical test equipment, geo- by the system’s logical test equipment, electric servo Testing System wear testing, and even amplifi er. No Technology aircraft structural testing intermediary such and dynamic simulation. as oil or air is required to create Historically, manufacturers and motion. System users of mechanical test ap- The Benefi ts compliance result- paratus and motion simulators ing from use of have accepted the inaccuracies, of All-Electric fl uid power is a inconvenience and high mainte- Test Actuator major contributor nance costs of hydraulic actua- to inaccuracy of tion. However, today’s simula- Systems tors and test stands are often hydraulic actua- Exlar’s patented roller used in environments where tor systems. The screw linear actuator contamination from oil leaks is higher stiffness of technology allows users to not permissable and greater ac- a planetary perform the analysis and testing curacy is required. Exlar offers roller screw-based actuator pro- needed to verify products’ de- a full range of all-electric test vides greater system response actuators and position controls signs without the high cost of in- and stability assuring precise which provide the dynamic per- stallation, constant maintenance, and crisp control, and stiffness formance and long life required environmental issues, and en- is not stroke-sensitive. for test and simulation equip- ergy consumption encountered ment. with servo hydraulic systems. Speed, Load Ratings and Lifetime Improved Control Exlar actuator systems due Exlar actuators allow designers to their design can operate at of motion simulators and test speeds of of 40 inches per sec- systems to experience a sub- ond which is substantially faster stantial improvement in than conventional servo hydrau- control over that lic systems. achieved using hydraulic Load ratings and lifetime for systems. all-electric systems compete handily with hydraulic systems, providing equivalent, and oftentimes greater performance. Given that an all-electric system requires very minimal maintenance, the load and life factor Fifteen years become distinct advantages experience in the design, over an hydraulic option. manufacture and implementa- tion of planetary roller screw actuators gives Exlar the edge in applying all-electric actuation for use in applications ranging from motion bases, hexapods, 2 Courtesy of Steven Engineering, Inc. - 230 Ryan Way, South San Francisco, CA 94080-5370 - Main Office: (650) 588-9200 - Outside Local Area: (800) 258-9200 - www.stevenengineering.com Reduced Service and Six Degree- Reduced Risk of of-Freedom Specimen Damage Maintenance Motion System control characteris- Exlar electric actuators Hexapod tics are maintained without eliminate the service and adjustment or tuning, over maintenance cost of complex widely varying environmental and contaminant-sensitive conditions, as calibration does hydraulic systems. This not depend on temperature savings combined with and contamination sensitive less installed cost means hydraulic valves and fl uid minimal ongoing mediums. Exlar actuators also expense. maintain a safe position upon the application or removal of Energy Savings power, thus reducing the risk With today’s cost of of inadvertent damage to test energy, power con- specimens. sumption is an important factor in Much Less Infrastructure choosing which technology is em- Exlar systems require only AC ployed. Exlar’s electromechanical No moving of plumbing, hoses, power with easy connection solutions are 80% energy effi cient and accumulators, no recali- of cables between the servo compared to 50% or less for fl uid bration, no bleeding of hydrau- amplifi er and the actuator. power actuation. This increased lic lines, and no clean-up is No hydraulic power supplies, effi ciency means lower long-term required. System operation is lines, water cooling or associ- cost. all digital eliminating drift and ated facilities are required, allowing continuous storage often reducing initial cost to a Reduced Set-up and and recall of set-up and cali- fraction of the cost of a hy- Reconfi guration Time bration parameters. draulic system Exlar’s servo actuators are con- nectorized in the most convenient Quiet Operation Space Savings manner allowing connection and Electric actuation is very quiet The space consumed by test disconnection with the simple twist compared to fl uid power system components can be of a connector. Once programmed, actuators. The noise level of critical to the design of the electric systems generally operate hydraulic actuators (not test cell as well as the space with little or no additional calibra- including the hydraulic power constraints of the facility. tion for the duration of its use. supply) can reach levels Because an electro- Simply un- of 85 decibels or more. Exlar mechanical system plug cables actuators operate at eliminates the need by hand (no high rates of speed and yet for the hydraulic tools re- maintain decibel levels in power module and quired) and the low 70’s. system piping, the position the overall area taken up actuator in by the system can be the new greatly reduced. This location and space savings can be reconnect to a key in providing an begin opera- effective and attractive tion. test or simulation system without the expense of adding or modifying your existing facility. 3 Courtesy of Steven Engineering, Inc. - 230 Ryan Way, South San Francisco, CA 94080-5370 - Main Office: (650) 588-9200 - Outside Local Area: (800) 258-9200 - www.stevenengineering.com research and creativity is a revo- on industrial equipment The Challenge lutionary design which incorpor- ranging from carpet weaving ates a high performance machines and machine tools, to For years, industry has sought brushless servo motor with a simulation and test equipment out a clean and effi cient all- novel mechanism for converting and submarines. All actuators electric alternative to hydrau- the motor’s power and speed to portray the unique characteristics lic and pneumatic cylinders. highly accurate and reliable linear of producing the power density, The promise of such a device motion. speed and robustness of hy- would be the elimination of the draulic and pneumatic actuation environmental issues associ- The Result — Since delivering without the inconvenience and ated with hydraulic fl uids, the the fi rst actuator to the world’s operating expense of fl uid power. noise and inconsistency of leading liquid packaging com- pneumatics, and a dramatic pany in 1993, the company has reduction in power consump- supplied over 10,000 units of tion. Today, process engineers this elegant but simple device are facing increasing demands for producing precise, yet highly for more accurate and better robust linear robust linear mo- responding position control. Epoxy-coated tion. Exlar’s inverted roller screw These trends are driven by actuators are being used today Aluminum Housing regulatory controls for cleanli- ness and effi ciency combined with the market’s demand for more accurate control of their processes. Engineers have Threaded Rollers universally agreed that the solution for addressing both Preloaded Angular these needs lies in an an all- electric actuator. The chal- Contact Bearings lenge has been to build such a device which delivers the promises of electric actuation, yet maintains the robustness and moderate cost of fl uid Chrome Plated power actuators. Extending Rod The Design — To meet this challenge, Exlar embarked on a mission to create a new kind of electrical actuator. Tradi- tional ball and acme screws were rejected due to their lack of robustness and limited service life when used in continuous motion applications. Direct acting electric actuators were found to be prohibitively expensive, energy ineffi cient, Sealed Output Rod and lacking the stability and stiffness needed to ensure ac- curacy. The result of Exlar’s 4 Courtesy of Steven Engineering, Inc. - 230 Ryan Way, South San Francisco, CA 94080-5370 - Main Office: (650) 588-9200 - Outside Local Area: (800) 258-9200 - www.stevenengineering.com all-electric actuator which is The Solution extremely compact, yet de- The Operation -- Exlar’s patented livers similar performance linear actuator is based on a to a hydraulic cylinder in unique design for integrating a terms of force, robustness robust and effi cient threaded roller to shock and long service mechanism into the interior of a life. high power density, high performance brushless servo motor. In response to current fl ow, This combination results in an the servo motor produces torque and power in rota- tion. The internal roller screw mechanism converts MS Style Connectors Std. the rotational motion and torque to a high force, high speed linear output to act on the the applied load. Construction includes a series of load-bearing, threaded rollers assembled The greater number of in a planetary arrangement. contact points in a roller This assembly pro- vides the mechanical screw compared to a ball interface between screw (above) gives roller the threaded inside screws a longer life, higher surface of the hollow load capacity and greater (rotating) cylinder and stiffness. the threaded

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